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15 May 2014 Optical fiber embedding in thermal spray coating promises new smart materials design able to operate under harsh environment
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Abstract
The in-situ detection of temperature or stresses produced by the thermal spraying process is important for both the optimization of the elaboration conditions and the subsequent service monitoring of these systems. Optical fiber sensors are excellent candidates for this area of application since they can be embedded into the layers of several dissimilar materials of smart structures. This work relates mainly to the process of embedding optical fibers into ceramic coatings and to the characteristics of the embedded fiber. Firstly, thermal flame spraying is chosen as the elaboration process. Next, a thermal model is proposed in order to evaluate the thermal strain variation with the temperature during the elaboration process in the structure. Finally, a microscopic observation of the embedded optical fiber in the ceramic coating is reported, the mechanical adhesion strength of the embedded fiber is evaluated and the results of the optical attenuation change during the elaboration process are given. They show that no significant fluctuation of the optical power transmitted in the fiber is observed.
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Yi Duo, Sophie Costil, Pierre Pfeiffer, and Bruno Serio "Optical fiber embedding in thermal spray coating promises new smart materials design able to operate under harsh environment", Proc. SPIE 9141, Optical Sensing and Detection III, 914112 (15 May 2014); https://doi.org/10.1117/12.2051807
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